Advanced search  
Pages: 1 ... 4 5 [6] 7 8 ... 18   Go Down

Author Topic: Can you add to the list of sextant numbers?  (Read 72007 times)

John Ousterhout

  • T4
  • ****
  • Posts: 479
Re: Can you add to the list of sextant numbers?
« Reply #75 on: February 03, 2012, 10:08:01 AM »

Daniel's finds are perfect examples of the differences to be expected between a marine sextant box, and an aircraft octant box.  The box dimensions and proportions are clearly different.  The box found on Gardner was clearly identified as suitable for a sextant, making it unlikely to have been associated with the Earhart flight. However, we can't be certain that it wasn't a transitional variant between the two different styles of boxes used in the mid-1930's.  There is a slim possibility that an aircraft octant might have been carried in a traditional sextant- style box.  By the late 1930's, octant boxes were all different from sextant boxes.
I have not heard yet if the Naval records office has found any documentation of the octant that Harry Manning loaned to Fred Noonan.  If/when I do I'll post the results here.
Cheers,
JohnO
 
Logged

Daniel Paul Cotts

  • T2
  • **
  • Posts: 66
Re: Can you add to the list of sextant numbers?
« Reply #76 on: February 07, 2012, 09:36:56 AM »

Here's an octant box that is closer in style to a sextant box.
PIONEER INSTRUMENT MARK III MODEL 7. Scroll down for more photos.
Unique Box
Logged

Daniel Paul Cotts

  • T2
  • **
  • Posts: 66
Re: Can you add to the list of sextant numbers?
« Reply #77 on: March 18, 2012, 11:12:01 PM »

Another Brandis on eBay: Brandis # 5577, NO# 4485. Numbers on instrument and box match. Certificate of Inspection lists class as "Survey."
Brandis Sextant
Logged

Martin X. Moleski, SJ

  • Administrator
  • *
  • Posts: 2258
Re: Can you add to the list of sextant numbers?
« Reply #78 on: March 19, 2012, 06:32:17 AM »

Another Brandis on eBay: Brandis # 5577, NO# 4485. Numbers on instrument and box match. Certificate of Inspection lists class as "Survey."
Brandis Sextant

Inspection date: 3/14/44

It's a very interesting box.  Handwritten in ink on the certificate of inspection: Use cigarette ashes to wash.  The Certificate of Inspection covers up another stamp on the box, which seems to read "754-7..." and "B..." on the left.  The instrument numbers are not die-stamped into the corners of the box.  In the upper-right corner of the inside cover, it looks as though the maker's name and address are stamped in ink, with, perhaps, some annotations in pen:

Brandis & Sons, Inc.
[ ??? ] Lexington Avenue
Brooklyn, N [ ??? ]

I've added it to the sextant numbers table.
LTM,

           Marty
           TIGHAR #2359
 
Logged

Daniel Paul Cotts

  • T2
  • **
  • Posts: 66
Re: Can you add to the list of sextant numbers?
« Reply #79 on: March 19, 2012, 01:21:46 PM »

Is there any advantage in listing sextant serial numbers that are far from the range surrounding #3500 and NO #1542?
Logged

Martin X. Moleski, SJ

  • Administrator
  • *
  • Posts: 2258
Re: Can you add to the list of sextant numbers?
« Reply #80 on: March 19, 2012, 02:26:25 PM »

Is there any advantage in listing sextant serial numbers that are far from the range surrounding #3500 and NO #1542?

What you see in the table is what we've found.

We're not suppressing any numbers.

I suppose you could say that we have enough data already to say that there isn't much of a correlation between the maker's number and the Naval Observatory number.  We also have enough to show folks in archives and museums why we would like to find the original records.  But it doesn't cost much to add to the list, and, as far as I can tell, it does no harm.
LTM,

           Marty
           TIGHAR #2359
 
Logged

Daniel Paul Cotts

  • T2
  • **
  • Posts: 66
Re: Can you add to the list of sextant numbers?
« Reply #81 on: April 20, 2012, 09:16:51 PM »

New listing on eBay for a Brandis. NO number is 1421. I've asked the seller for additional info.
Brandis NO1421

I'll be away from this forum due to time management issues. If anyone cares to keep searching for new Brandis listings on eBay - just save the search for "sextant + brandis". eBay will notify you each time a new listing appears.
Logged

Martin X. Moleski, SJ

  • Administrator
  • *
  • Posts: 2258
Re: Can you add to the list of sextant numbers?
« Reply #82 on: April 20, 2012, 10:34:37 PM »

New listing on eBay for a Brandis. NO number is 1421. I've asked the seller for additional info.
Brandis NO1421

Thanks!

I've put the number in the sextant table.
LTM,

           Marty
           TIGHAR #2359
 
Logged

Andrew M McKenna

  • Administrator
  • *
  • Posts: 401
  • Here I am during the Maid of Harlech Survey.
Re: Can you add to the list of sextant numbers?
« Reply #83 on: April 21, 2012, 11:18:56 AM »

Looks like the number stenciled on the box near the right hinge is 4551 or 4553

Need to know the maker's number printed on the arc.  I've asked as well.

amck
Logged

Martin X. Moleski, SJ

  • Administrator
  • *
  • Posts: 2258
Re: Can you add to the list of sextant numbers?
« Reply #84 on: April 21, 2012, 12:20:25 PM »

Looks like the number stenciled on the box near the right hinge is 4551 or 4553

Good eyes!  I've put in 4551 for the moment.
LTM,

           Marty
           TIGHAR #2359
 
Logged

Daniel Paul Cotts

  • T2
  • **
  • Posts: 66
Re: Can you add to the list of sextant numbers?
« Reply #85 on: April 22, 2012, 01:21:11 PM »

Vendor replies the manufacturer's number on the arc is 3331. The number on the box is 4551. As before the NO is 1421.

The Gardner box had 3500 and 1542 on it. I like the above numbers.
Logged

Martin X. Moleski, SJ

  • Administrator
  • *
  • Posts: 2258
Re: Can you add to the list of sextant numbers?
« Reply #86 on: April 22, 2012, 04:57:17 PM »

Vendor replies the manufacturer's number on the arc is 3331. The number on the box is 4551. As before the NO is 1421.

The Gardner box had 3500 and 1542 on it. I like the above numbers.

3500/1542 are still in play as a possible combination of Brandis number and N.O. number.  In this excerpt from the table, the sextants are ordered by Naval Observatory number.  Brandis numbers 3331, 3444 and 3500 (?) are in a nice order, but then we get 3483 with a higher N.O. number than 3500 (?) and 3339 with a lower N.O. number than 3331.


serial number   
N.O. number   
N.O. inspection date   
Brandis
3339
1415
1942-12-26
Brandis
3331
1421
Brandis
3444
1461
Brandis?
  3500
  1542
Brandis (box only)
3483
1567
1932-01-27
LTM,

           Marty
           TIGHAR #2359
 
« Last Edit: April 22, 2012, 05:01:30 PM by Martin X. Moleski, SJ »
Logged

Gary LaPook

  • T5
  • *****
  • Posts: 1624
Re: Can you add to the list of sextant numbers?
« Reply #87 on: April 22, 2012, 06:48:55 PM »

Here's an octant box that is closer in style to a sextant box.
PIONEER INSTRUMENT MARK III MODEL 7. Scroll down for more photos.
Unique Box
But that box and octant came well after the Earhart disappearance, it wasn't produced until 1941.

gl
Logged

Daniel Paul Cotts

  • T2
  • **
  • Posts: 66
Re: Can you add to the list of sextant numbers?
« Reply #88 on: April 22, 2012, 08:55:06 PM »

Thanks Marty for the above post. If we assume the Navy purchased sextants in batches, there would be no compelling reason to test them in order of manufacturer's serial number. However, the grouping of NO numbers around a particular set of manufacturer's numbers (the bounds of the batch) seems significant. Let's hope a few more sextants show up in the desired range.
Logged

Martin X. Moleski, SJ

  • Administrator
  • *
  • Posts: 2258
Re: Can you add to the list of sextant numbers?
« Reply #89 on: April 22, 2012, 10:20:41 PM »

Thanks Marty for the above post. If we assume the Navy purchased sextants in batches, there would be no compelling reason to test them in order of manufacturer's serial number. However, the grouping of NO numbers around a particular set of manufacturer's numbers (the bounds of the batch) seems significant. Let's hope a few more sextants show up in the desired range.

We can make the case that we have noted Brandis serial numbers running from 1844 to 5760.

We may make a reasonable surmise that, once upon a time, there was a Brandis numbered 3500.

We have noted N.O. numbers from 34 to at least 9746 (there are some dashed numbers, such as 5083-44 that represent a change in the numbering system, I believe).

We may make a reasonable surmise that, once upon a time, N.O. 1547 was assigned to an instrument.

In the absence of actually finding the long-sought logbooks, we can't say that Brandis 3500 was N.O. 1547.  At best, we can say it might have been.

If we do find a Brandis 3500 with a different N.O. number, or a N.O. 1547 that is not serial number 3500, then that would destroy the idea that the box found on Niku may once have held a Navy instrument.
LTM,

           Marty
           TIGHAR #2359
 
Logged
Pages: 1 ... 4 5 [6] 7 8 ... 18   Go Up
 

Copyright 2014 by TIGHAR, a non-profit foundation. No portion of the TIGHAR Website may be reproduced by xerographic, photographic, digital or any other means for any purpose. No portion of the TIGHAR Website may be stored in a retrieval system, copied, transmitted or transferred in any form or by any means, whether electronic, mechanical, digital, photographic, magnetic or otherwise, for any purpose without the express, written permission of TIGHAR. All rights reserved.

Contact us at: info@tighar.org • Phone: 610-467-1937 • Membership formwebmaster@tighar.org

Powered by MySQL SMF 2.0.8 | SMF © 2014, Simple Machines Powered by PHP